Laminated Structural Engineering Strategy toward Carbon Nanotube-Based Aerogel Films

Fu, Changhui; Sheng, Zhizhi; Zhang, Xuetong

doi:10.1021/acsnano.2c02193

Cited by 70 publications

(47 citation statements)

References 71 publications

(135 reference statements)

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“…The good Joule heating performance can be used for wearable thermal management devices, such as warmth or heat therapy . As shown in Figure a, the highest temperature on the surface of aCAM-3 aerogel can reach 22.8 °C at a constant voltage of 2 V. As the voltage increases, the surface temperature can reach up to 104 °C at 8 V. Figure b shows the temperature changes of aCAM-3 surface over time under different voltages.…”

Section: Resultsmentioning

confidence: 99%

MXene/CNTs/Aramid Aerogels for Electromagnetic Interference Shielding and Joule Heating

Yan

Ding

Huang

et al. 2023

ACS Appl. Nano Mater.

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It is a considerable challenge to develop a composite material with ultra-light and high electromagnetic interference (EMI) shielding efficiency for the next generation of electronic equipment. MXenes have received extensive attention in composite aerogel EMI shielding due to their abundant surface groups and ultra-high conductivity. However, the poor mechanical properties make them difficult to apply on a large scale. Here, we demonstrate a simple method to construct ultra-light conductive Ti 3 C 2 T x MXene/aramid nanofibers (ANFs)/carbon nanotubes (CNTs) aerogels with a "sandwich" structure. CNTs and MXene absorb and reflect electromagnetic waves, while ANF aerogel provides good mechanical strength.Our composite aerogels with an extra-high EMI shielding efficiency of up to 69.0 dB at the X-band, despite their thickness and density being only 2 mm and 0.0428 g/cm 3 , respectively. At the same time, the composite aerogel with a low 0.0488 W/(m•K) thermal conductivity shows extraordinary flame resistance, heat preservation, and insulation ability. Besides, MXene/ANFs/CNTs aerogel can reach 104 °C in 3 s under an 8 V voltage and shows long-term Joule heating stability. This work provides a forward-looking idea for building multifunctional EMI shielding materials. The obtained aerogels have potential applications in aerospace, portable electronic devices, and defense industries.

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Section: Resultsmentioning

confidence: 99%

MXene/CNTs/Aramid Aerogels for Electromagnetic Interference Shielding and Joule Heating

Yan

Ding

Huang

et al. 2023

ACS Appl. Nano Mater.

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“…[ 22 ] After compression treatment, the more closed connection between continuous carbon structure of wood facilitates the rapid transport of electrons. [ 23 ] Therefore, compared with the carbonized wood (WC) without compressing, the conductivities of CWF samples are significantly improved (Table S1, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, materials need to achieve a high shielding effect at low thickness and density. [ 23 ] The thicknesses and densities of samples are recorded in Figure 4b. The thickness of wood film is reduced from 0.5 mm to ≈0.2 mm.…”

Section: Resultsmentioning

confidence: 99%

“…[11,29] The natural hierarchical porous structure and densely layered framework make the CWF/ZIF-8 have good electrical conductivity, which can produce strong EM multiple scattering and reflection. [23] The rest of the EM wave enters the skeleton of the carbonized wood film and interacts with the electrons, producing an ohmic current loss. In addition, due to the densely layered framework of CWF/ZIF-8, EM waves will repeat the loss process of the previous layer when passing through each channel, thereby achieving the progressive loss of EM waves layer by layer.…”

Section: Resultsmentioning

confidence: 99%

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Ultrathin Wood‐Derived Conductive Carbon Composite Film for Electromagnetic Shielding and Electric Heating Management

Pan

Guo

et al. 2023

Adv Funct Materials

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Recently, wood‐based composites have absorbed widespread concern in the field of electromagnetic interference (EMI) shielding due to their sustainability and inherent layered porous structure. The channel structure of wood is often used to load highly conductive materials to improve the EMI shielding performance of wood‐based composites. However, there is little research on how to use pure wood to prepare ultrathin EMI shielding materials. Herein, ultrathin veneer is obtained by cutting wood in parallel to the annual rings. Then, carbonized wood film (CWF) is prepared by a simple two‐step compressing and carbonization. The specific EMI shielding effectiveness (SSE/t) of CWF‐1200 with an ultrathin thickness (140 µm) and high electrical conductivity (58 S cm−1) can reach 9861.41 dB cm2 g−1, which is much higher than other reported wood‐based materials. In addition, the zeolitie imidazolate framework‐8 (ZIF‐8) nanocrystals are grown in situ on the surface of the CWF to obtain CWF/ZIF‐8. CWF/ZIF‐8 exhibits an EMI shielding effectiveness (SE) of up to 46 dB and an ultrahigh SSE/t value of 11 330.04 dB cm2 g−1 in X band. In addition, the ultrathin CWF also shows an excellent Joule heating effect. Therefore, the development of ultrathin wood‐based film provides a research basis for wood biomass to replace traditional non‐renewable and expensive electromagnetic (EM) shielding materials.

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“…Obviously, WC with higher density has better shielding performance. It may be that the wood with high density has a denser structure after carbonization, which is more conducive to the conduction of electrons and shows a higher conductivity [ 49 ]. Conductivity is an important factor of EM shielding materials.…”

Section: Resultsmentioning

confidence: 99%

High Value Utilization of Waste Wood toward Porous and Lightweight Carbon Monolith with EMI Shielding, Heat Insulation and Mechanical Properties

Han

et al. 2023

Molecules

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With the increasing pollution of electromagnetic (EM) radiation, it is necessary to develop low-cost, renewable electromagnetic interference (EMI) shielding materials. Herein, wood-derived carbon (WC) materials for EMI shielding are prepared by one-step carbonization of renewable wood. With the increase in carbonization temperature, the conductivity and EMI performance of WC increase gradually. At the same carbonization temperature, the denser WC has better conductivity and higher EMI performance. In addition, due to the layered superimposed conductive channel structure, the WC in the vertical-section shows better EMI shielding performance than that in the cross-section. After excluding the influence of thickness and density, the specific EMI shielding effectiveness (SSE/t) value can be calculated to further optimize tree species. We further discuss the mechanism of the influence of the microstructure of WC on its EMI shielding properties. In addition, the lightweight WC EMI material also has good hydrophobicity and heat insulation properties, as well as good mechanical properties.

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Laminated Structural Engineering Strategy toward Carbon Nanotube-Based Aerogel Films

Cited by 70 publications

References 71 publications

MXene/CNTs/Aramid Aerogels for Electromagnetic Interference Shielding and Joule Heating

MXene/CNTs/Aramid Aerogels for Electromagnetic Interference Shielding and Joule Heating

Ultrathin Wood‐Derived Conductive Carbon Composite Film for Electromagnetic Shielding and Electric Heating Management

High Value Utilization of Waste Wood toward Porous and Lightweight Carbon Monolith with EMI Shielding, Heat Insulation and Mechanical Properties

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